Primer question

[compass will]

If I switch from Winchester Large Rifle to Winchester magnum Large Rifle, should i expect major changes in my loads? since I am shooting cast only, just under 2000fps in guns like 32 and 30-30 with h4198, do I need to reduce my loads and start over?

This is a PITA, just at the start of lever gun silhouette season and I am running out of primers.

I guess before long I might have the same question for my 45 colt loads.

last year I bought an AR15 A2, but instead of wanting to chase brass and reload all that .223, I bought a barrel that is dedicated to .22lr. And I can't find much ammo for it either!

[Matt_G]

Magnum primers are hotter than standard primers, so yes, I would suggest you back off and work the load up again.

EDIT
Meant to add, that I doubt it would be unsafe, but it will likely affect the accuracy.
You'll need to find the sweet spot again, as it will most likely change.

[Calamity Jake]

You might lower the charge a ½ grain and sight in again cause POI will change a little, other than that you should be just fine.